TS2518 Upgraded Aperture & lost all but 2 identified faces

I got prompted to upgrade to Aperture 3.4.3 and when it finished, I found that all but two of my faces that I identified (hundreds of photos) were gone. Anyone have any ideas on how to fix this / why this happened? Thanks.

UPDATE -- I figured it out. There was a search term defaulted on the Faces screen, so it was only displaying faces that matched that search term. Doh! Not sure why it was there, but at least its not all lost!

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